EP3710728B1 - Rotary tensioner - Google Patents
Rotary tensioner Download PDFInfo
- Publication number
- EP3710728B1 EP3710728B1 EP18812549.6A EP18812549A EP3710728B1 EP 3710728 B1 EP3710728 B1 EP 3710728B1 EP 18812549 A EP18812549 A EP 18812549A EP 3710728 B1 EP3710728 B1 EP 3710728B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tensioner
- rotary
- arm
- base
- ring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000013016 damping Methods 0.000 claims description 8
- 238000004804 winding Methods 0.000 claims description 6
- 230000000717 retained effect Effects 0.000 claims 1
- 239000000428 dust Substances 0.000 description 3
- 230000036316 preload Effects 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003534 oscillatory effect Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H7/10—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley
- F16H7/12—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley
- F16H7/1254—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley without vibration damping means
- F16H7/1281—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley without vibration damping means where the axis of the pulley moves along a substantially circular path
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H7/10—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley
- F16H7/12—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley
- F16H7/1209—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley with vibration damping means
- F16H7/1218—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley with vibration damping means of the dry friction type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H2007/0802—Actuators for final output members
- F16H2007/081—Torsion springs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H2007/0842—Mounting or support of tensioner
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H2007/0863—Finally actuated members, e.g. constructional details thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H2007/0863—Finally actuated members, e.g. constructional details thereof
- F16H2007/0865—Pulleys
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H2007/0863—Finally actuated members, e.g. constructional details thereof
- F16H2007/0874—Two or more finally actuated members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H2007/0889—Path of movement of the finally actuated member
- F16H2007/0893—Circular path
Definitions
- the invention relates to a tensioner, and more particularly, to a rotary tensioner having a first torsion spring in a swing arm on a rotary arm, and a second torsion spring biasing a rotary ring and the rotary arm.
- a tensioner is typically used to apply a preload to the belt in order to prevent slippage.
- the tensioner can be mounted to an engine mounting surface
- the engine may further comprise a start-stop system whereby the engine will shut down when the vehicle is not in motion, and when a driver command is received to proceed the engine will restart.
- the start-stop function will tend to reverse loading on the belt.
- tensioners are available to accommodate belt load reversals.
- the tensioner may comprise one or more components which independently pivot in order to properly apply a required belt preload force in both belt drive directions.
- the tensioner may also be mounted directly to an accessory such as an alternator in order to save space in the engine bay.
- WO2014/100894 discloses a tensioner for tensioning an endless drive member that is engaged with a rotary drive member on a shaft of a motive device.
- the tensioner includes a base that is mountable to the motive device, a ring that is rotatably supported by the base in surrounding relationship with the shaft of the motive device and which is rotatable about a ring axis, a tensioner arm pivotally mounted to the ring for pivotal movement about an arm pivot axis, and first and second tensioner pulleys.
- the first tensioner pulley is rotatably mounted to the tensioner arm.
- the tensioner arm is biased towards a first span of the endless drive member on one side of the rotary drive member.
- the second tensioner pulley is rotatably mounted at least indirectly to the ring and is biased towards a second span of the endless drive member on another side of the rotary drive member.
- the ring is rotatable in response to hub loads in the first and second tensioner pulleys that result from engagement with the first and second spans of the endless drive member.
- WO 2014/100894 A1 discloses an orbital tensioner assembly for tensioning an endless drive member that is engaged with a rotary drive member on a shaft of a motive device.
- the tensioner includes a base that is mountable to the motive device, a ring that is rotatably supported by the base in surrounding relationship with the shaft of the motive device and which is rotatable about a ring axis, a tensioner arm pivotally mounted to the ring for pivotal movement about an arm pivot axis, and first and second tensioner pulleys.
- the first tensioner pulley is rotatably mounted to the tensioner arm.
- the tensioner arm is biased towards a first span of the endless drive member on one side of the rotary drive member.
- the second tensioner pulley is rotatably mounted at least indirectly to the ring and is biased towards a second span of the endless drive member on another side of the rotary drive member.
- the ring is rotatable in response to hub loads in the first and second tensioner pulleys that result from engagement with the first and second spans of the endless drive member.
- a rotary tensioner having a first torsion spring in a swing arm on a rotary arm, and a second torsion spring biasing a rotary ring and the rotary arm.
- the present invention meets this need.
- the primary aspect of the invention is to provide a rotary tensioner having a first torsion spring in a swing arm on a rotary arm, and a second torsion spring biasing a rotary ring and the rotary arm.
- the invention comprises a tensioner comprising a base having a base aperture, the base aperture having an axis A-A and capable of receiving a driven component, a rotary arm rotatably engaged with the base and encircling the base aperture, a swing arm pivotally engaged with the rotary arm, a first torsion spring biasing the swing arm, a first pulley journalled to the swing arm, and characterized by a rotary ring rotatably encircling the base aperture and disposed between the rotary arm and the base, a second pulley journalled to the rotary ring, a second torsion spring engaged between the rotary ring and the rotary arm for biasing the rotary ring, and a wave spring in pressing engagement between the base and the rotary ring.
- FIG. 1 is a top perspective view.
- Rotary tensioner 1000 comprises a base 100, rotary arm 200, rotary ring 400 and a swing arm tensioner 300.
- Rotary tensioner 1000 has a generally circular form to accommodate installation on a belt driven machine (BDM).
- Base 100 is used to mount the inventive device to a belt driven machine such as an alternator, starter generator or motor generator unit. Such units are typically used in so-called engine start-stop applications.
- a driven shaft pulley P of the BDM projects through base aperture 103.
- Mounting portions 102 receive fasteners such as bolts or screws to attach the tensioner 1000 to the BDM.
- Rotary arm 200 is rotatably engaged with base 100. Retaining ring 101 retains rotary arm 200 on base 100. Retaining ring 101 may be press fit or clamped to base 100. Rotary arm 200 is rotatable about base aperture 103 on axis A-A.
- Tensioner swing arm 300 is pivotally mounted to rotary arm 200 on an axis B-B. Pulley 301 is journalled to pivot arm 300. Torsion spring 600 biases pivot arm 300 toward pulley 401 and into engagement with a drive belt (not shown), thereby applying a belt load. Torsion spring 600 is loaded in the unwinding direction.
- Rotary ring 400 is rotatably engaged between rotary arm 200 and base 100.
- Rotary ring 400 is rotatable about axis A-A and base aperture 103.
- Pulley 401 is journalled to rotary ring 400.
- Torsion spring 500 is engaged between the rotary arm 200 and rotary ring 400. Torsion spring 500 is loaded in the unwinding direction. Torsion spring 500 causes pulley 401 to resist the force exerted by torsion spring 600 through pulley 301. Torsion spring 500 is enclosed in part within rotary arm 200 and rotary ring 400.
- the use of two torsion springs (500, 600) divides the significant rotational requirements and torque requirements of this tensioner in its intended service, thereby ensuring proper performance.
- the intended service can include use in the accessory belt drive for a start-stop engine configuration.
- Figure 2 is a cross sectional view.
- a shaft pulley P of the BDM extends through base aperture 103 along axis A-A such that a drive belt B will engage pulley P on a BDM shaft as well as pulley 301 and pulley 401.
- Pivot axis B-B of swing arm 300 is disposed radially from and is not coaxial with axis A-A. Pivot axis B-B is disposed outside the base aperture 103.
- FIG 3 is a cross sectional detail of Figure 2 .
- Damping band 402 and damping band 403 frictionally engage with and damp oscillatory movements of rotary arm 200 and rotary ring 400.
- Damping band 402 and 403 comprise frictional materials known in the tensioner damping arts.
- a wave style spring 404 presses the stack comprising damping band 403, rotary ring 400, damping band 402, rotary arm 200 and bushing 201 into contact with retaining ring 101, thereby providing a normal force necessary to generate frictional damping forces.
- Spring 404 bears upon base 100.
- Low-friction bushing 201 facilitates relative movement of rotary arm 200 with respect to base 100.
- Bushing 201 locates rotary arm 200 and rotary ring 400 with respect to base aperture 103.
- FIG. 4 is an exploded view. Pulley 301 is fastened to swing arm 300 by a bolt 302. Pulley 401 is fastened to rotary ring 400 by a bolt 406. Dust cover 407 and dust cover 408 prevent debris from entering a pulley bearing. Dust cover 303 prevents debris from entering a pulley bearing.
- spring 500 and spring 600 are depicted in Figure 4 wherein the tensioner can be made to operate in either a spring unwinding under load or spring winding under load.
- spring 500 and spring 600 is used in the spring unwinding to load mode. Each spring 500 and spring 600 is loaded in a spring unwinding direction.
- Spring 500 engages rotary ring 400 and rotary arm 200.
- Spring 600 engages rotary arm 200 and swing arm 300.
- spring 500 and 600 can be loaded in a winding direction.
- spring 500a and spring 600a each replace spring 500 and spring 600 respectively.
- Spring 500a comprises a tab 500b and 500c extending therefrom.
- Tab 500b engages rotary ring 400 and tab 500c engages rotary arm slot 200c.
- Spring 600 comprises a tab 600b and 600c extending therefrom.
- Tab 600b engages rotary arm 200 and tab 600c engages swing arm 300.
- an unwinding spring 500 or 600 may be used with a winding spring 500a or 600a.
- spring 500 with spring 600a, or spring 500a with spring 600 depending on the needs of a user.
- FIG. 5 is a cross section of the swing arm tensioner.
- Swing arm 300 pivots about shaft 304.
- Shaft 304 is fixed to rotary arm 200.
- Low-friction bushing 305 facilitates movement of swing arm 300 on shaft 304.
- Pulley 301 is journalled on a bearing 306 to shaft 304.
- FIG. 6 is a perspective view of the device on a driven machine.
- the driven pulley P of the BDM projects into and through base aperture 103.
- the BDM is typically mounted to a vehicle engine and is driven by a drive belt B.
- Belt B engages pulley P, pulley 301 and pulley 401.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
Description
- The invention relates to a tensioner, and more particularly, to a rotary tensioner having a first torsion spring in a swing arm on a rotary arm, and a second torsion spring biasing a rotary ring and the rotary arm.
- Most internal combustion engines comprise accessories such as power steering, an alternator and air conditioning to name a few. These accessories are typically driven by a belt. A tensioner is typically used to apply a preload to the belt in order to prevent slippage. The tensioner can be mounted to an engine mounting surface
- The engine may further comprise a start-stop system whereby the engine will shut down when the vehicle is not in motion, and when a driver command is received to proceed the engine will restart.
- The start-stop function will tend to reverse loading on the belt. Hence, tensioners are available to accommodate belt load reversals. The tensioner may comprise one or more components which independently pivot in order to properly apply a required belt preload force in both belt drive directions. The tensioner may also be mounted directly to an accessory such as an alternator in order to save space in the engine bay.
- Representative of the art is
WO2014/100894 which discloses a tensioner for tensioning an endless drive member that is engaged with a rotary drive member on a shaft of a motive device. The tensioner includes a base that is mountable to the motive device, a ring that is rotatably supported by the base in surrounding relationship with the shaft of the motive device and which is rotatable about a ring axis, a tensioner arm pivotally mounted to the ring for pivotal movement about an arm pivot axis, and first and second tensioner pulleys. The first tensioner pulley is rotatably mounted to the tensioner arm. The tensioner arm is biased towards a first span of the endless drive member on one side of the rotary drive member. The second tensioner pulley is rotatably mounted at least indirectly to the ring and is biased towards a second span of the endless drive member on another side of the rotary drive member. The ring is rotatable in response to hub loads in the first and second tensioner pulleys that result from engagement with the first and second spans of the endless drive member. -
WO 2014/100894 A1 discloses an orbital tensioner assembly for tensioning an endless drive member that is engaged with a rotary drive member on a shaft of a motive device. The tensioner includes a base that is mountable to the motive device, a ring that is rotatably supported by the base in surrounding relationship with the shaft of the motive device and which is rotatable about a ring axis, a tensioner arm pivotally mounted to the ring for pivotal movement about an arm pivot axis, and first and second tensioner pulleys. The first tensioner pulley is rotatably mounted to the tensioner arm. The tensioner arm is biased towards a first span of the endless drive member on one side of the rotary drive member. The second tensioner pulley is rotatably mounted at least indirectly to the ring and is biased towards a second span of the endless drive member on another side of the rotary drive member. The ring is rotatable in response to hub loads in the first and second tensioner pulleys that result from engagement with the first and second spans of the endless drive member. - What is needed is a rotary tensioner having a first torsion spring in a swing arm on a rotary arm, and a second torsion spring biasing a rotary ring and the rotary arm. The present invention meets this need.
- The primary aspect of the invention is to provide a rotary tensioner having a first torsion spring in a swing arm on a rotary arm, and a second torsion spring biasing a rotary ring and the rotary arm.
- Other aspects of the invention will be pointed out or made obvious by the following description of the invention and the accompanying drawings.
- The invention comprises a tensioner comprising a base having a base aperture, the base aperture having an axis A-A and capable of receiving a driven component, a rotary arm rotatably engaged with the base and encircling the base aperture, a swing arm pivotally engaged with the rotary arm, a first torsion spring biasing the swing arm, a first pulley journalled to the swing arm, and characterized by a rotary ring rotatably encircling the base aperture and disposed between the rotary arm and the base, a second pulley journalled to the rotary ring, a second torsion spring engaged between the rotary ring and the rotary arm for biasing the rotary ring, and a wave spring in pressing engagement between the base and the rotary ring.
- The accompanying drawings, which are incorporated in and form a part of the specification, illustrate preferred embodiments of the present invention, and together with a description, serve to explain the principles of the invention.
-
Figure 1 is a top perspective view. -
Figure 2 is a cross sectional view. -
Figure 3 is a cross sectional detail ofFigure 2 . -
Figure 4 is an exploded view. -
Figure 5 is a cross section of the swing arm tensioner. -
Figure 6 is a perspective view of the device on a driven machine. -
Figure 1 is a top perspective view.Rotary tensioner 1000 comprises abase 100,rotary arm 200,rotary ring 400 and aswing arm tensioner 300.Rotary tensioner 1000 has a generally circular form to accommodate installation on a belt driven machine (BDM).Base 100 is used to mount the inventive device to a belt driven machine such as an alternator, starter generator or motor generator unit. Such units are typically used in so-called engine start-stop applications. A driven shaft pulley P of the BDM projects throughbase aperture 103. Mountingportions 102 receive fasteners such as bolts or screws to attach thetensioner 1000 to the BDM. -
Rotary arm 200 is rotatably engaged withbase 100. Retainingring 101 retainsrotary arm 200 onbase 100. Retainingring 101 may be press fit or clamped tobase 100.Rotary arm 200 is rotatable aboutbase aperture 103 on axis A-A. -
Tensioner swing arm 300 is pivotally mounted torotary arm 200 on an axis B-B. Pulley 301 is journalled to pivotarm 300.Torsion spring 600biases pivot arm 300 towardpulley 401 and into engagement with a drive belt (not shown), thereby applying a belt load.Torsion spring 600 is loaded in the unwinding direction. - Rotary
ring 400 is rotatably engaged betweenrotary arm 200 andbase 100. Rotaryring 400 is rotatable about axis A-A andbase aperture 103. Pulley 401 is journalled torotary ring 400. -
Torsion spring 500 is engaged between therotary arm 200 androtary ring 400.Torsion spring 500 is loaded in the unwinding direction.Torsion spring 500 causespulley 401 to resist the force exerted bytorsion spring 600 throughpulley 301.Torsion spring 500 is enclosed in part withinrotary arm 200 androtary ring 400. - The use of two torsion springs (500, 600) divides the significant rotational requirements and torque requirements of this tensioner in its intended service, thereby ensuring proper performance. The intended service can include use in the accessory belt drive for a start-stop engine configuration.
-
Figure 2 is a cross sectional view. A shaft pulley P of the BDM extends throughbase aperture 103 along axis A-A such that a drive belt B will engage pulley P on a BDM shaft as well aspulley 301 andpulley 401. - Pivot axis B-B of
swing arm 300 is disposed radially from and is not coaxial with axis A-A. Pivot axis B-B is disposed outside thebase aperture 103. -
Figure 3 is a cross sectional detail ofFigure 2 . Dampingband 402 and dampingband 403 frictionally engage with and damp oscillatory movements ofrotary arm 200 androtary ring 400. Dampingband wave style spring 404 presses the stack comprising dampingband 403,rotary ring 400, dampingband 402,rotary arm 200 andbushing 201 into contact with retainingring 101, thereby providing a normal force necessary to generate frictional damping forces.Spring 404 bears uponbase 100. Low-friction bushing 201 facilitates relative movement ofrotary arm 200 with respect tobase 100.Bushing 201 locatesrotary arm 200 androtary ring 400 with respect tobase aperture 103. -
Figure 4 is an exploded view.Pulley 301 is fastened to swingarm 300 by abolt 302.Pulley 401 is fastened torotary ring 400 by abolt 406.Dust cover 407 anddust cover 408 prevent debris from entering a pulley bearing.Dust cover 303 prevents debris from entering a pulley bearing. - Two springs are depicted in
Figure 4 wherein the tensioner can be made to operate in either a spring unwinding under load or spring winding under load. In the spring unwinding to load mode,spring 500 andspring 600 is used. Eachspring 500 andspring 600 is loaded in a spring unwinding direction.Spring 500 engagesrotary ring 400 androtary arm 200.Spring 600 engagesrotary arm 200 andswing arm 300. - In an
alternate embodiment spring direction embodiment spring 500a andspring 600a each replacespring 500 andspring 600 respectively. -
Spring 500a comprises atab 500b and 500c extending therefrom.Tab 500b engagesrotary ring 400 and tab 500c engages rotary arm slot 200c.Spring 600 comprises atab 600b and 600c extending therefrom.Tab 600b engagesrotary arm 200 and tab 600c engagesswing arm 300. - In yet another embodiment, an unwinding
spring spring spring 500 withspring 600a, orspring 500a withspring 600 depending on the needs of a user. -
Figure 5 is a cross section of the swing arm tensioner.Swing arm 300 pivots aboutshaft 304.Shaft 304 is fixed torotary arm 200. Low-friction bushing 305 facilitates movement ofswing arm 300 onshaft 304.Pulley 301 is journalled on abearing 306 toshaft 304. -
Figure 6 is a perspective view of the device on a driven machine. The driven pulley P of the BDM projects into and throughbase aperture 103. The BDM is typically mounted to a vehicle engine and is driven by a drive belt B. Belt B engages pulley P,pulley 301 andpulley 401.
Claims (12)
- A tensioner (1000) comprising:a base (100) having a base aperture (103), the base aperture (103) having an axis A-A and capable of receiving a driven component (P);a rotary arm (200) rotatably engaged with the base (100) and encircling the base aperture (103);a swing arm (300) pivotally engaged with the rotary arm (200), a first torsion spring (600) biasing the swing arm (300), a first pulley (301) journalled to the swing arm (300); and characterised by:a rotary ring (400) rotatably encircling the base aperture (103) and disposed between the rotary arm (200) and the base (100), a second pulley (401) journalled to the rotary ring (400);a second torsion spring (500) engaged between the rotary ring (400) and the rotary arm (200) for biasing the rotary ring (400); anda wave spring (404) in pressing engagement between the base (1000) and the rotary ring (400).
- The tensioner (1000) as in claim 1, wherein the rotary arm (200) and the rotary ring (400) coaxially rotate about axis A-A.
- The tensioner (1000) as in claim 1, wherein the driven component (P) rotates on the axis A-A.
- The tensioner (1000) as in claim 1, wherein the first torsion spring (600) is loaded in the unwinding direction.
- The tensioner (1000) as in claim 1, wherein the second torsion spring (500) is loaded in the unwinding direction.
- The tensioner (1000) as in claim 1 further comprising a damping member (402, 403) in frictional engagement with the rotary arm (200) and the rotary ring (400).
- The tensioner (1000) as in claim 1, wherein the base (100) is fixedly attachable to a driven component (P).
- The tensioner (1000) as in claim 1, wherein the pivot axis B-B of the swing arm (300) is disposed radially from axis A-A.
- The tensioner (1000) as in claim 1, wherein the pivot axis B-B is disposed outside of the base aperture (103).
- The tensioner (1000) as in claim 1, wherein the rotary arm (200) is retained by a retaining member (101) attached to the base (100).
- The tensioner (1000) as in claim 1, wherein the first torsion spring (600) is loaded in the winding direction.
- The tensioner (1000) as in claim 1, wherein the second torsion spring (500) is loaded in the winding direction.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/815,408 US10746264B2 (en) | 2017-11-16 | 2017-11-16 | Rotary tensioner |
PCT/US2018/061088 WO2019099543A1 (en) | 2017-11-16 | 2018-11-14 | Rotary tensioner |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3710728A1 EP3710728A1 (en) | 2020-09-23 |
EP3710728B1 true EP3710728B1 (en) | 2021-09-29 |
Family
ID=64572579
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18812549.6A Active EP3710728B1 (en) | 2017-11-16 | 2018-11-14 | Rotary tensioner |
Country Status (6)
Country | Link |
---|---|
US (1) | US10746264B2 (en) |
EP (1) | EP3710728B1 (en) |
JP (1) | JP6898525B2 (en) |
CN (1) | CN111356863B (en) |
CA (1) | CA3082420C (en) |
WO (1) | WO2019099543A1 (en) |
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DE102016217933B4 (en) * | 2016-09-20 | 2020-06-04 | Schaeffler Technologies AG & Co. KG | Belt tensioner |
DE102017107047A1 (en) * | 2017-03-31 | 2018-10-04 | Muhr Und Bender Kg | Clamping device with adjusting mechanism and method for adjusting the torque of the clamping device |
IT201700053588A1 (en) * | 2017-05-17 | 2018-11-17 | Dayco Europe Srl | TENSIONER FOR A TRANSMISSION ACCESSORIES OF A MOTOR VEHICLE |
DE102017217645A1 (en) * | 2017-10-05 | 2019-04-11 | Bayerische Motoren Werke Aktiengesellschaft | Belt tensioner |
KR102506926B1 (en) * | 2017-12-18 | 2023-03-07 | 현대자동차 주식회사 | Dual tensioner and engine provided with the same |
US11333223B2 (en) * | 2019-08-06 | 2022-05-17 | Gates Corporation | Orbital tensioner |
DE102020004335A1 (en) * | 2020-07-20 | 2022-01-20 | Muhr Und Bender Kg | Belt tensioning device and belt drive with such a belt tensioning device |
US20220099165A1 (en) * | 2020-09-28 | 2022-03-31 | Caterpillar Inc. | Engine accessory drive system and one-piece bracket for same |
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-
2017
- 2017-11-16 US US15/815,408 patent/US10746264B2/en active Active
-
2018
- 2018-11-14 CN CN201880074023.3A patent/CN111356863B/en active Active
- 2018-11-14 JP JP2020527091A patent/JP6898525B2/en active Active
- 2018-11-14 WO PCT/US2018/061088 patent/WO2019099543A1/en unknown
- 2018-11-14 CA CA3082420A patent/CA3082420C/en active Active
- 2018-11-14 EP EP18812549.6A patent/EP3710728B1/en active Active
Also Published As
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CN111356863A (en) | 2020-06-30 |
WO2019099543A1 (en) | 2019-05-23 |
CN111356863B (en) | 2023-05-26 |
US20190145501A1 (en) | 2019-05-16 |
CA3082420C (en) | 2021-12-28 |
EP3710728A1 (en) | 2020-09-23 |
CA3082420A1 (en) | 2019-05-23 |
JP2021503583A (en) | 2021-02-12 |
JP6898525B2 (en) | 2021-07-07 |
US10746264B2 (en) | 2020-08-18 |
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